Enrique Tarrio, the leader of the Proud Boys extremist group, has a past as an informer for federal and local law enforcement, repeatedly working undercover for investigators.
The threat of political violence is looming large in the US and it's likely to get worse in the coming days as Trump supporters continue to believe in his Big Lie about a stolen election.
The Capitol Police force did not request advance help to secure the building from other federal agencies such as the Department of Homeland Security, according to one senior official.
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